On average, listings lease in the $20's per square foot per year. The Whitehall region is going through a an increase in rates. In the last 3 months, the median rate increased $21 per sqft per year.
In the last 90 days, 3 listings have been listed, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. About 100% of the office spaces in the Whitehall are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,300 sqft. Most buildings in this market are around 1 stories. Most buildings in this area were built in 1968 and are Class C.